Fig. 2: Methane concentrations and water–air fluxes in study estuaries grouped by estuary type and disturbance.
From: Low methane emissions from Australian estuaries influenced by geomorphology and disturbance
Both CH4 concentrations (row 1) and fluxes (row 2) are averaged per minute in estuary types: a lagoons (blue; n = 3789), small deltas (green; n = 3622), and tidal systems (yellow; n = 5720), and in disturbance classes (dark to light grey): b low (n = 1796), moderate (n = 3189), high (n = 3677) and very high (n = 4469). Each graph includes the mean (red asterisk), median (red bar), 1st and 3rd quartiles (box limits), and the furthest minimum and maximum values (whiskers) that fall within 1.5× the interquartile range. Outliers have been excluded from the graphs (Table 2). The letters above the plots signify statistical differences between groups. Dotted lines along the y-axis represent zero water–air CH4 flux. Note the variations in y-axis scaling. Plot data can be found in Supplementary Data 1.
